Hi All, Section 12.7.3 (b) gives that flexibility of panel zones should be considered in steel moment frames. My understanding is that the AISC Direct Analysis Method including 0.8 and τb stiffness reductions does not address this. The ASCE commentary indicates that using semi-rigid end zones...
Thank you for the responses. It does indeed that the section allows for a different importance factor only with independent systems, and this is not the case I described. There was some discussion in our office and indeed it appears that your answers are accurate with the intent (and really...
Hi Mario, I agree with Huajie and would also add that the Two-Stage Procedure (Section 12.2.3.2) does not explicitly address a change in Importance therefore I would assume this is not anticipated – or maybe that it was discussed and the authors could not envision such a scenario. In...
Hi Mario, Section 1.5.2 is the appropriate provision. It states that where the portions of a building have independent structural systems, different Risk Categories may be assigned. However, the word independent is key. Since the upper wood frame portion is supported by the lower concrete...
We are designing a hotel with the wood framed rooms (risk category II, ignoring floors below) built over a multi level concrete podium. One floor down from the wood framed hotel rooms, on the concrete podium, there is a ballroom/conference center (risk category III, based on occupancy). ...
There is overlap between components covered by ASCE Chapters 13 and 15. Philosophically, Chapter 13 covers relatively small components supported above grade in a building and Chapter 15 covers nonbuilding structures (large components) supported at grade. As I mentioned there is overlap between...
Currently API is using chapter 13 of ASCE for design of pipe supports regardless of whether they are attached to a building or not. In my mind pipe supports not attached to a building would be designed per chapter 15 and not chapter 13 as they are not a mechanical/electrical component of a...
ASCE 7-16 Commentary Section C13.4.6 states that for friction clips “under no circumstances should they be relied on to resist sustained gravity loads” because sustained gravity loads could slip out of the friction clip as the friction diminishes over time. Please note that Section 13.4 states ...